dft_max_chain_length                               Sets the maximum number
                                                   of registers that can be
                                                   in one scan chain.
 [ tree ]                                            Applies the constraint to
                                                     all levels of hierarchy
                                                     below the object(s)
                                                     specified.
 [ -scope ]                 scope                    module / current scope
 chain_length                                        positive integer
